Question: What is an historical period that starts with the letter v.
Paraphrase: What is an authentic period that begins with the letter v.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q11514315 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'v')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Victorian era, Victorian era, Vikings, Vikings, viking expansion, viking expansion, Virgilian series, Virgilian series, Visoko during the Middle Ages, Visoko during the Middle Ages, Viking Age, Viking Age, Variscan orogeny, Variscan orogeny